I found a link to an altered trailer for The Shining on no less than three of my regular sites yesterday (Defective Yeti, Little Yellow Different, Metafilter) and it is indeed worthy of mention.
This is the winner of a contest where people were told to re-edit a movie trailer to make it seem as totally different a sort of film as possible. Incredibly well done. Apparently the guy who did it was recently contacted by the Vice President of Warner Brothers who liked it too.
Two other entries include some slice and dice work with West Side Story and Titanic.